United States · 
Who invested in Adden Energy?
Adden Energy's investors include MassVentures and At One Ventures.
20252026
$15MSeries A$17MRound
United States · Series A startup
Who invested in Adden Energy
Funding summaryUpdated 26 Oct 2026
$32Mraised across 2 rounds since 2024, from 2 sources
$15MSeries A$17MRound
- Latest round
- Round, $17MOct 2026
- Investors
- 2
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Series A, $15M Sept 2024
- Biggest round
- $17M Round · Oct 2026
- Between rounds
- 2.1 years from the last two
The rounds
- Oct 2026Round$17M
No investor was named in the report.
Filed with the SEC (Form D); no report of this raise yetSEC filing: $17M sold, first sale Oct 2026
- Sept 2024Series A$15M2 new
Source recordedSEC filing: $15M sold, first sale Aug 2024
Founders and team
From Adden Energy's own website: 5 on the team.
Who was in which round
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Quick answers about Adden Energy
How much has Adden Energy raised?
Adden Energy has raised $32M across 2 rounds since 2024.
When did Adden Energy last raise?
Adden Energy's most recent round, $17M, was in Oct 2026.
What was Adden Energy's biggest round?
Its most recent round, $17M in Oct 2026, is also its largest on record.
Who backed Adden Energy first?
Adden Energy's first round on record, in Sept 2024, was backed by MassVentures and At One Ventures.
What stage is Adden Energy at?
Adden Energy's latest named round is a Series A, in Sept 2024.
Where is Adden Energy based?
Adden Energy is based in the United States.
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